Hi there Can anyone shed some light on an issue I am having on a Yale MR16 reach truck DC controller with a Zapi SEM controller and Zapi Pump unit.

When we turn the key on it energises ok, when we turn the hadnbrake switch off the light goes off the dash but the brake itself does not release and then comes up 'pressure not ok' error.

The way we can get the handbrake to release is by using the hydraulics, once we activate the hydraulics it releases the handbrake?

Tried changing the pressure switch but made no difference. Checked the solenoid valves resistance seem ok.

Went into the pump controller with a zapi handset and found that the handbrake switch was not activating on or off when we turned the handbrake switch, however the connections into the controller for handbrake input etc all seem ok. My initial thought was that it could be a controller fault, however have been told by a Yale engineer that this was a known problem on these Yales and it is not related to the controller. Can anyone please shed some light on this issue if you have come across this before.

Regards